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@ARTICLE{MhrEbert:845583,
      author       = {Mühr-Ebert, E. L. and Lichte, E. and Bukaemskiy, A. and
                      Finkeldei, S. and Klinkenberg, M. and Brandt, F. and
                      Bosbach, D. and Modolo, G.},
      title        = {{D}issolution behavior of {M}g{O} based inert matrix fuel
                      for the transmutation of minor actinides},
      journal      = {Journal of nuclear materials},
      volume       = {505},
      issn         = {0022-3115},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-02808},
      pages        = {94 - 104},
      year         = {2018},
      abstract     = {This study explores the dissolution properties of
                      magnesia-based inert matrix nuclear fuel (IMF) containing
                      transuranium elements (TRU). Pure MgO pellets as well as MgO
                      pellets containing CeO2, as surrogate for TRU oxides, and
                      are considered as model systems for genuine magnesia based
                      inert matrix fuel were fabricated. The aim of this study is
                      to identify conditions at which the matrix material can be
                      selectively dissolved during the head-end reprocessing step,
                      allowing a separation of MgO from the actinides, whereas the
                      actinides remain undissolved. The dissolution behavior was
                      studied in macroscopic batch experiments as a function of
                      nitric acid concentration, dissolution medium volume,
                      temperature, stirring velocity, and pellet density (85, 90,
                      96, and $99\%TD).$ To mimic pellets with various burn-ups
                      the density of the here fabricated pellets was varied. MgO
                      is soluble even under mild conditions (RT, 2.5 mol/L
                      HNO3). The dissolution rates of MgO at different acid
                      concentrations are rather similar, whereas the dissolution
                      rate is strongly dependent on the temperature. Via a
                      microscopic approach, a model was developed to describe the
                      evolution of the pellet surface area during dissolution and
                      determine a surface normalized dissolution rate. Moreover,
                      dissolution rates of the inert matrix fuel containing CeO2
                      were determined as a function of the acid concentration and
                      temperature. During the dissolution of MgO/CeO2 pellets the
                      MgO dissolves completely, while CeO2 $(>99\%)$ remains
                      undissolved. This study intends to provide a profound
                      understanding of the chemical performance of magnesia based
                      IMF containing fissile material. The feasibility of the
                      dissolution of magnesia based IMF with nitric acid is
                      discussed.},
      cin          = {IEK-6},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {161 - Nuclear Waste Management (POF3-161) / ASGARD -
                      Advanced fuelS for Generation IV reActors: Reprocessing and
                      Dissolution (295825)},
      pid          = {G:(DE-HGF)POF3-161 / G:(EU-Grant)295825},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000432845800012},
      doi          = {10.1016/j.jnucmat.2018.04.001},
      url          = {https://juser.fz-juelich.de/record/845583},
}